MX2007000285A - Bleaching composition comprising a cyclic hindered amine. - Google Patents

Abstract

The present invention relates to a liquid bleaching composition comprising a hypohalite bleach, a cyclic hindered amine and a compound selected from the group consisting of bleach-unstable brighteners, bleach-unstable coloring-agents and mixtures thereof.

Description

WHITENING COMPOSITION COMPRISING A CYCLICAL AMINE IMPEDED TECHNICAL FIELD The present invention relates to bleaching compositions, specifically to hypohalide bleaching compositions, which can be used to treat various surfaces including, but not limited to, fabrics, clothing, carpets and the like, and also hard surfaces, such as walls, tiles, floors, glass, bathroom surfaces, kitchen surfaces, toilet bowls, and crockery.

BACKGROUND OF THE INVENTION Bleach-containing compositions for bleaching various surfaces, eg fabrics, are well known in the industry. Among the different bleaching compositions available, those based on the whitening produced by a hypohalide bleach, such as hypochlorite, are generally preferred, mainly for their bleaching performance. It is convenient to add additional ingredients to the compositions containing the hypohalide bleach. Effectively, in order to improve the bleaching performance of said compositions whitening, it can be beneficial to add a brightener (also known as fluorescent whitening agent). In addition, to improve the aesthetics of such bleaching compositions, the addition of a dye or pigment can be considered. However, a disadvantage associated with the use of compositions containing a hypohalide bleach, for example, the hypochlorite-based compositions, is that some of the additional ingredients, which are added with the hypohalide bleach, can be broken down by the action of the bleach. Clearly, hypohalide bleaches are oxidizing agents and some of the additional ingredients may be prone to attack and, in some cases, to be broken down partially or even completely by the action of these oxidizing agents. Accordingly, some additional ingredients, such as certain brighteners, certain pigments and / or certain dyes, are difficult to incorporate into compositions containing a hypohalide bleach. Herein, additional ingredients that are prone to partial or even total decomposition in compositions containing a hypohalide bleach are termed "unstable ingredients in the presence of bleach." In contrast, additional ingredients that are not prone to partial or even total decomposition in compositions containing hypohalide bleach are referred to herein as "stable in the presence of bleach." One way to avoid the partial or even total decomposition of the additional ingredients present in the compositions containing a hypohalide bleach is to incorporate stabilization systems in the bleaching compositions. Indeed, it is known in the industry to add to the compositions containing hypohalide bleach a radical scavenger or other stabilizing agent to prevent or at least reduce the decomposition of the additional ingredients, in particular the unstable ingredients in the presence of bleaches, present in the the bleaching compositions. For example, EP-A-0 668 345 and EP-A-1 001 010 describe bleaching compositions comprising a hypohalide bleach and a radical scavenger. However, even though these stabilization systems and, in particular, the radical scavengers are able to stabilize some of the additional ingredients that are unstable in the presence of bleach, such as surfactants, it was found that the brighteners unstable in the presence of bleach, unstable pigments in the presence of bleach and / or unstable dyes in the presence of bleach are especially prone to be attacked by hypohalide bleach and, therefore, extremely difficult to incorporate in a stable manner in bleaching compositions that they comprise the known stabilization systems. Clearly, although the systems described in the industry provide the stabilization of other unstable ingredients in the presence of bleach in the compositions containing a bleach of hypohalide, it has been found that it is possible to further improve the stabilization of unstable brighteners in the presence of bleach and / or unstable coloring agents in the presence of bleach (such as pigments and / or dyes). Indeed, specifically, the stabilization of unstable brighteners in the presence of bleach and / or unstable coloring agents in the presence of bleach (such as pigments and / or dyes) during prolonged periods of storage ("in storage") can still be improved plus. It is, therefore, an object of the present invention to provide a bleaching composition containing a hypohalide bleach and comprising a compound selected from the group consisting of unstable brighteners in the presence of bleach and unstable coloring agents in the presence of bleach and mixtures thereof, wherein the decomposition of said compound is significantly reduced or even avoided. It has recently been discovered that this objective can be achieved by using a liquid bleaching composition comprising a hypohalide bleach, a hindered cyclic amine and a compound selected from the group consisting of unstable brighteners in the presence of bleach and unstable coloring agents in the presence of bleach and mixtures of these. Favorably, the bleaching composition, as described herein, also allows to considerably reduce or even prevent the decomposition of a compound selected from the group formed by unstable brighteners in the presence of bleach, unstable coloring agents in the presence of bleach and mixtures thereof during the storage of said bleaching composition. An additional advantage of the bleaching compositions according to the present invention is that they exhibit excellent bleaching performance. Specifically, the compositions of the present invention offer excellent bleaching performance when used in any laundry application ("fabric treatment applications"), for example, as a laundry detergent, laundry additive and / or pretreatment agent. laundry. Another advantage of the compositions of the present invention is that they are suitable for the cleaning of different types of fabrics including natural fabrics (for example, fabrics made of cotton, viscose, linen, silk and wool), synthetic fabrics, such as those They are made of polymeric fibers of synthetic origin and also those that are made of both synthetic and natural fibers. Yet another advantage of the bleaching compositions of the present invention is that these bleaching compositions are also suitable for bleaching different types of surfaces, including hard surfaces such as floors, walls, tiles, glass, kitchen surfaces, bathroom surfaces, toilet bowls, etc. toilet and / or tableware and the like, in addition to the fabric treatment applications mentioned above.

EP-A-1 391 501 discloses a method for stabilizing the viscosity of a composition containing hypohalide bleach using a selected group of hindered amines. However, it does not provide any indication that hindered amines are suitable for stabilizing brighteners and / or unstable coloring agents in the presence of bleach. Similarly, WO 01/07550 discloses a bleaching composition comprising a hindered amine claimed in said patent for reducing the deterioration of the dyed fabrics.

BRIEF DESCRIPTION OF THE INVENTION The present invention comprises a liquid whitening composition comprising a hypohalide bleach, a hindered cyclic amine and a compound selected from the group consisting of unstable brighteners in the presence of bleach and unstable coloring agents in the presence of bleach and mixtures thereof. The present invention also comprises a method for reducing or preventing the decomposition of a compound selected from the group consisting of unstable brighteners in the presence of bleach, unstable coloring agents in the presence of bleach and mixtures thereof, in a bleaching composition comprising a bleach of hypohalide; said method comprises incorporating a hindered cyclic amine in the bleaching composition.

In another embodiment of the present invention, a process for treating a fabric is provided; said process comprises the step of applying the liquid bleaching composition of the present invention on the fabric to be treated. In a further aspect, the present invention relates to the use, in a bleaching composition comprising a hypohalide bleach, of a cyclic hindered amine to reduce or prevent the decomposition of a compound selected from the group consisting of unstable brighteners in the presence of bleach. , unstable coloring agents in the presence of bleach and mixtures of these, in the bleaching composition.

DETAILED DESCRIPTION OF THE INVENTION Bleaching Composition Bleaching compositions herein are formulated as liquids including gel and paste forms. The bleaching compositions are formulated, preferably but not necessarily, as aqueous compositions. Preferred liquid bleaching compositions in the present invention are aqueous and therefore, preferably, can comprise water, more preferably, they can comprise water in an amount of 60% to 98%, even more preferably, 80% to 97% and , with the highest preference, from 85% to 97%, by weight of the total composition. Preferably, the compositions of the present invention are thickened. Thickening can be achieved by adding thickening components such as surfactants, more specifically, anionic surfactants. Q Liquid compositions according to the present invention are preferably alkaline compositions. The pH of the liquid compositions herein, as is, is preferably 10 to 14 measured at 25 ° C; more preferably, from 11 to 14; even more preferably, from 12 to 13.7 and, most preferably, from 12.5 to 13.05. It is in this alkaline range that optimum stability and performance of the hypohalide is obtained and also the whiteness and / or optimum care for the fabric. Accordingly, the compositions herein may further comprise an acid or a source of alkalinity to regulate the pH as appropriate. Suitable sources of alkalinity are caustic alkalis, such as sodium hydroxide, potassium hydroxide and / or lithium hydroxide, and / or alkali metal oxides, such as sodium and / or potassium oxide. A preferred alkalinity source is a caustic alkali, more preferably, sodium hydroxide and / or potassium hydroxide. Typical concentrations of said alkalinity sources, when present, are from 0.1% to 1.5% by weight, preferably from 0.5% to 1.5%, by weight of the composition.

Hypohalide bleach As the first essential ingredient, the bleaching compositions of the present invention comprise a hypohalide bleach or a mixture thereof.

Suitable hypohalide bleaches can be supplied through a variety of sources, including bleaches that produce positive halide ions and / or hypohalide ions, as well as bleaches that are an organic source of halides such as chloroisocyanurates. Suitable hypohalide bleaches for use herein include hypochlorites, hypobromites and hypoiodites of alkali metal and alkaline earth metal, chlorinated trisodium phosphate dodecahydrates, potassium and sodium dichloroisocyanurates, potassium and sodium trichlorocyanurates, N-chloroimides, N -chloroamides, N-chloroamines and chloro hydantoins. In a preferred embodiment, said hypohalide bleach is an alkali metal and / or alkaline earth metal hypochlorite. More preferably, the hypohalide bleach is an alkali metal and / or alkaline earth metal hypochlorite selected from the group consisting of sodium hypochlorite, potassium hypochlorite, magnesium hypochlorite, lithium hypochlorite, calcium hypochlorite and mixtures thereof. Even more preferably, said hypohalide bleach is sodium hypochlorite. Preferably, the liquid bleaching compositions herein comprise said hypohalide bleach so that the content of active halide (by hypochlorite: AvCl2) in the composition is from 0.01% to 20% by weight, more preferably, from 0.1% to 10% by weight, even more preferably, from 0.5% to 6% and, with the highest preference, from 1% to 6%, by weight of the composition.

Cyclic hindered amine As a second essential element of the compositions of the present invention, they comprise a hindered cyclic amine as a general stabilizer. Preferably, the hindered cyclic amine has the general formula: wherein XL X2, X3 and X4, independently or together, represent methyl or ethyl; Ri is H, methyl, ethyl, oxyl, hydroxyl group or alkoxy; and R2 is H, hydroxyl, alkoxy or oxycarbonyl. In the context of the present invention, hindered cyclic amines are also referred to as hindered cyclic nitroxyl compounds or hindered cyclic hydroxylamines. In a preferred embodiment, X2, X3 and X are identical and are generally selected to be methyl. RT usually select from the oxyl and hydroxyl group. Preferably, RT represents the oxyl group. R2 is generally selected from the group of hydroxyl, alkoxy and oxycarbonyl. In a preferred embodiment, R2 is preferably selected to be hydroxyl. Preferably, said hindered cyclic amine is selected from the group consisting of 4-hydroxy-2,2,6,6-tetramethyl piperidine; 4-methoxy-2,6,6,6-tetramethyl piperidine; 4-ethoxy-2, 2,6,6-tetramethyl piperidine; 4-propoxy-2, 2,6,6-tetramethyl piperidine 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxy piperidine; 1-hydroxy-2,2,6,6-tetramethyl-4-methoxypiperidine; 1-hydroxy-2, 2,6,6-tetramethyl-4-ethoxy piperidine; 1-hydroxy-2,2,6,6-tetramethyl-4-propoxy piperidine; bis (1-hydroxy-2,2,6,6-tetramethyl piperidine-4-yl) sebacate; 1-oxoyl-2,2,6,6-tetramethyl piperidine; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine acetate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine propanoate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine butyrate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine pentanoate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine hexanoate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine heptanoate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine octanoate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine nonanoate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine decanoate; 1-oxyl-2, 2,6,6-tetramethyl-4-hydroxy piperidine undecanoate; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine dodecanoate; propandioate of bis (1-oxyl-2, 2,6,6-tetramethyl piperidin-4-yl); bis (1-oxyl-2,2,6,6-tetramethyl piperidin-4-yl) butanedioate; pentadenedioate of bis (1-oxyl-2, 2,6,6-tetramethyl piperidin-4-yl); bis (1-oxyl-2, 2,6,6-tetramethyl piperidin-4-yl hexaloate); heptandioate of bis (1-oxyl-2, 2,6,6,6-tetramethyl piperidin-4-yl); bis (1-oxyl-2,2,6,6-tetramethyl piperidin-4-yl) octanedioate; nonandioate of bis (1-oxyl-2,2,6,6-tetramethyl piperidin-4-yl); bis (1-oxyl-2,2,6,6-tetramethyl piperidin-4-yl) sebacate; dodecanedioate of bis (1-oxyl-2, 2, 6, 6-tetramethyl piperidin-4-yl)); 1-oxyl-2,2,6,6-tetramethyl-4-methoxy piperidine; 1-oxyl-2,2,6,6-tetramethyl-4-ethoxy piperidine; 1-oxyl-2,2,6,6-tetramethyl-4-propoxy piperidine and mixtures thereof. In a preferred embodiment, the hindered cyclic amine is selected from the group consisting of 4-hydroxy-2, 2,6,6-tetramethyl piperidine; 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxy piperidine; 1-oxyl-2, 2, 6, 6, -tetramethyl piperidine; 1-oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine. In a particularly preferred embodiment, the hindered cyclic amine is 1-oxyl-2,2,6,6, -tetramethyl-4-hydroxy piperidine (ie, X ^ X2, X3 and X4 are methyl; R2 is hydroxyl). The appropriate 4-hydroxy-2,2,6,6-tetramethyl-piperidinyloxy is commercially available through 3V Sigma, under the tradename Tempoxy LO®, from Aldrich or from Lancaster, under the trade name 4- hydroxy-TEMPO. In another particularly preferred embodiment, the hindered cyclic amine is 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxy piperidine (i.e., X1 t X2, X3 and X4 are methyl, Ri is hydroxyl and R2 is hydroxyl). Suitable 1-hydroxy-2, 2,6,6-tetramethyl-4-hydroxy piperidine is commercially available from Ciba under the trade name Tinogard® SF-X. Typically, the bleaching composition herein may comprise from 0.001% to 5%, preferably, from 0.005% to 2.5%, with more preferably, from 0.01% to 1.0% and, most preferably, from 0.02% to 0.05%, by weight of the total composition of said hindered cyclic amine.

Compound selected from the group consisting of unstable brighteners in the presence of bleach and unstable coloring agents in the presence of bleach As a third essential element, the compositions of the present invention comprise a compound selected from the group consisting of unstable brighteners in the presence of bleach and agents unstable colorants in the presence of bleach and mixtures thereof. As used herein, the term "unstable compound in the presence of bleach" means that said compound will decompose at least partially or even completely when incorporated into a composition containing hypohalide bleach and the composition is free of any preservative system. stabilization. In practice, bleaching compositions, as described herein, are not used immediately after their manufacture. Indeed, after their preparation, bleaching compositions are sent to their points of sale, stored for a time at the point of sale (shelf storage), and finally stored by the end user of said bleaching composition before use. These prolonged storage conditions subsequent to the manufacture of the bleaching compositions herein have to be be taken into account when determining whether an ingredient or compound is or is not stable in the presence of bleach. The stability of a compound in the presence of bleach can be evaluated in the laboratory by the use of a rapid aging test ("RAT", for its acronym in English). The rapid aging test or RAT simulates, under laboratory conditions, the prolonged storage conditions subsequent to the manufacture of the bleaching compositions herein. The aqueous compositions for the RAT test comprise 3% active chlorine by weight of the composition (3.15% sodium hypochlorite) and 0.02% by weight of the brightener to be used for the stability test in the presence of bleach or 0.002% by weight of the coloring agent that will be used for the stability test in the presence of bleach. The compositions are stored for 10 days at 50 ° C ± 0.5 ° C and the activity of said compound is evaluated after 10 days of storage. Accordingly, the phrase "unstable in the presence of bleach" is to be understood herein as a brightener that generally experiences more than 80% loss of activity at 50 ° C ± 0.5 ° C after 10 days of storage compared to its activity in a fresh or "fresh" composition comprising 0% active halide by weight of the composition (in order to avoid immediate decomposition of the compound) and 0.02% by weight of brightener.

Herein, the term "coloring agent" is to be understood as a pigment and / or a dye and / or other materials that are used to provide color to the liquid compositions herein. Normally, water-insoluble coloring agents are called pigments, and water-soluble coloring agents are called dyes. However, in the previous industry, these definitions are not followed in all instances. Therefore, to avoid confusion, the term "coloring agent" encompasses all available means for providing color to a liquid composition. Accordingly, the term "unstable agent in the presence of bleach" is to be understood herein as a coloring agent that generally experiences more than 80% loss of activity for the dye or pigment at 50 ° C ± 0.5 ° C after 10 days of storage compared to its activity in a fresh or "fresh" composition comprising 0% active halide by weight of the composition (in order to avoid immediate decomposition of the compound) and 0.002% by weight of the dye or pigment. At the moment, it should be understood by "activity" for a brightener, its fluorescence, and for the coloring agents, its ability to provide color to a composition. To evaluate the loss of activity caused by the bleach in a specific brightener, an "aged" composition comprising 3% active chlorine by weight of the composition (3.1% sodium hypochlorite) is exposed to the action of ultraviolet rays. and 0.02% by weight of said brightener, aged in a rapid aging test or RAT, as described above, and compares its fluorescence with that of a fresh or "fresh" composition, also exposed to the action of ultraviolet rays, comprising 0% of active halide by weight of the composition and 0.02% by weight of said compound. The loss of activity of a brightener caused by the bleach can be judged by visual qualification. The visual qualification can be carried out by a group of expert panelists through the use of panel rating units (PSU), applying a scale of PSU from 0, which means that there is no appreciable difference in the fluorescence of the "aged" composition compared to the fresh or "fresh" composition, up to 5, which means that there is a clearly noticeable difference between the fluorescence of the "aged" composition and the fresh or "fresh" composition . For example, a PSU score of 1 means a loss of fluorescence activity of 20% in an "aged" composition with respect to said activity in a fresh or "fresh" composition. Alternatively, the loss of activity of a brightener caused by the bleach can be assessed by HPLC analysis (high pressure liquid chromatography) tests, where the brightener concentrations before or after a RAT test They measure quantitatively.

To evaluate the loss of activity of a specific coloring agent (such as a pigment or dye) caused by the bleach, the color of an "aged" composition comprising 3% active chlorine by weight of the composition (3.15% sodium hypochlorite) and 0.002% by weight of said aged coloring agent in a RAT test, as described above, is compared to the color of a fresh or "fresh" composition comprising 0% active halide by weight of the composition and 0.002% by weight of said coloring agent. The loss of activity of a specific coloring agent caused by the bleach can be judged by visual qualification. The visual qualification can be carried out by a group of expert panelists through the use of panel rating units (PSU), applying a scale of PSU that goes from 0, which means that there is no appreciable difference in the color of the composition "aged" compared to fresh or "fresh" composition, up to 5, which means that there is a clearly noticeable difference between the color of the "aged" composition and that of the fresh or "fresh" composition. For example, a PSU score of 1 means a loss of coloring activity of 20% in an "aged" composition with respect to said activity in a fresh or "fresh" composition. Alternatively, the loss of activity of a specific coloring agent caused by the bleach can be evaluated by analysis tests using a spectrometer. Specifically, the instrument used is a Lambda UV / VIS (ultraviolet / visible) spectrometer from Perkin Elmer.

Unstable brighteners in the presence of bleach The compositions herein may comprise an unstable brightener in the presence of bleach, as described hereinabove. The unstable brightener in the presence of bleach can be incorporated in a concentration from 0.001% to 1.0%, preferably from 0.005% to 0.5%, more preferably from 0.005% to 0.3% and, most preferably, from 0.008% to 0.1%. %, by weight of the composition. Examples of unstable brighteners in the presence of bleach that are suitable include: 4,4'-bis- (2-sulphotryl) -biphenyl disodium, 4,4'-bis [(4,6-di-anilino-S-triazine -2-yl) -amino] stilbene 2,2 'disulfonate disodium and 4,4'-bis - [(4-anilino-6-morpholin-S-triazine-2-yl) -amino] -stilbene 2,2' disulfonate, 4,4'-bis - [(4-anilino-6-bis-2 (2-hydroxyethyl) -amino-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate, and mixtures of these. In addition, the unstable brighteners in the presence of bleach useful in the present invention are those that have the structural formula: wherein R ^ is selected from anilino, N-2-bis-hydroxyethyl and NH-2-hydroxyethyl; R2 is selected from N-2-bis-hydroxyethyl, N-2-hydroxyethyl-N-methylamino, morphino, chloro and amino; and M is a salt-fog cation, such as sodium or potassium.

When in the above formula, Ri is anilino, R2 is N-2-bis-hydroxyethyl and M is a cation such as sodium, the brightener is acid 4,4 ', - bis [(4-anilino-6- (N- 2-bis-hydroxyethyl) -s-triazine-2-yl) amino] -2,2'-stilbene disulfonic acid and disodium salt. This particular kind of brightener is commercially available under the trademark Tinopal-UNPA-GX® from Ciba Specialty Chemicals. When in the above formula, Ri is anilino, R2 is N-2-hydroxyethyl-N-2-methylamino and M is a cation such as sodium, the brightener is disodium salt of 4,4'-bis [(4-anilino -6- (N-2-hydroxyethyl-N-methylamino) -S-triazine-2-yl) amino] 2,2'-stilbenedisulfonic acid. This particular kind of brightener is commercially available under the trademark Tinopal 5BM-GX® from Ciba Specialty Chemicals. When in the above formula, Ri is anilino, R2 is morphino and M is a cation such as sodium, the brightener is sodium salt of 4,4'-bis [(4-anilino-6-morphino-s-triazine-2 -yl) amino] 2,2'-stilbenedisulfonic acid. This particular kind of brightener is commercially available under the trademark AMS-GX® from Ciba Specialty Chemicals. Another unstable brightener in the presence of bleach that is suitable is Optiblanc BRB® commercially available through 3V Sigma. Other substituted derivatives of stilbene 2,2'-disulfonic acid also include 4,4'-bis- (2-sulphotryl) -biphenyl disodium, commercially available from Ciba Specialty Chemicals under the tradename Tinopal CBS-X®, or other hydrophilic brighteners, such as, for example, 4,4'-bis - [(4- Anilino-6-bis-2 (2-hydroxyethyl) -amino-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate, also commercially available from Ciba Specialty Chemicals. The unstable brighteners in the presence of bleach which are preferred herein are selected from the group consisting of: 4,4'-bis- (2-sulphotryl) -biphenyl disodium (commercially available under the trade name Tinopal CBS-X) ®, by Ciba Specialty Chemicals); 4,4'-bis - [(4,6-di-anilino-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate disodium (commercially available from Ciba Specialty Chemicals); 4,4'-bis - [(4-anilino-6-morpholin-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate (commercially available from Ciba Specialty Chemicals); and 4,4'-bis - [(4-anilino-6-bis-2 (2-hydroxyethyl) -amino-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate (distributed on the market by Ciba Specialty Chemicals); and mixtures of these. In a particularly preferred embodiment in accordance with the present invention, the unstable brightener in the presence of bleach herein is 4,4'-bis- (2-sulphotryl) -biphenyl disodium. 4,4'-Bis- (2-sulphotrisyl) -biphenyl disodium is commercially available under the trade name Tinopal CBS-X® from Ciba Specialty Chemicals. Accordingly, the phrase "stable in the presence of bleach" is to be understood herein as a brightener that generally experiences a loss of activity that is equal to or less than 80% at 50 ° C ± 0.5 ° C after 10 days of storage with respect to its activity in a fresh or "fresh" composition comprising 0% active halide by weight of the composition (to avoid immediate decomposition of the compound) and 0.02% by weight of the polish. Examples of stable brighteners in the presence of bleach include bis 2,2'-benzoxazole- (thiophenediyl) with the formula C18H10N2O2S, commercially available from Ciba Specialty Chemicals under the tradename Tinopal SOP®. Another example of a brightener of this type is bis (sulfobenzofuranyl) biphenyl, commercially available from Ciba Specialty Chemicals under the trade name Tinopal PLC®.

Unstable coloring agents in the presence of bleach The compositions herein may comprise an unstable coloring agent in the presence of bleach, as described above. The unstable coloring agent in the presence of bleach can be incorporated in a concentration from 0.001% to 1.0%, preferably from 0.005% to 0.5%, more preferably from 0.005% to 0.3% and, most preferably, from 0.008% by weight. 0.1%, by weight of the composition. Examples of suitable unstable coloring agents in the presence of bleach include cupric phthalocyanine blue (commercially available under the trade name Dye Pigmosol Blue 6900®, from BASF), Accosperse cyan blue GT, Aqualine blue, Arlocyanine blue PS , Bahama blue BC, Bermuda blue, Blue GLA, phthalocyanine blue form alpha, Blue toner GTNF BT 4651, Calcotone blue GP, Ceres blue BHR, Chromatex blue BN, Chromofine blue 4920, Cl (Color Index or color index) no. 74160, C.l. blue pigment 15, Congo blue B 4, copper (ll) phthalocyanine, copper phthalocyanine, beta copper phthalocyanine, copper (2+) phthalocyanine, alpha copper phthalocyanine, beta copper phthalocyanine, copper phthalocyanine blue, copper-tetrabenzoporphirazine, Cromofine blue 4950, Cromophtal blue 4G, copper phthalocyanine, Cyan blue BNC 55-3745, Cyanine blue BB and others, Cyan peacock blue G, Dainichi cyanine blue B, Daltolite fast blue B, Duratint blue 1001, EM blue NCB, Euvinyl blue 702, Fastogen blue 5007, Fastolux blue, Fastolux peacock blue, Fenalac blue B disp, Franconia blue A 4431, Graphtol blue BL, Helium blue B, Helium fast blue B, Heliogen blue and others, Hostaperm blue AFN, Irgalite blue BCA, Irgalite blue LGLD , Irgalite fast brilliant blue BL, Irgaplast blue RBP, Isol fast blue B, Isol fast blue toner BT, Isol phthalo blue B, Japan blue 404, LBX 5, Leophoton, ERPC Lioconductor, Lionol blue E, Liophoton blue ER, Liophoton ERPC, Liophoton TPH 278, Lufilen blue 70-8100, Lumatex blue B, Lutet ia fast cyanine R, Lutetia percyanine BRS, Microlith blue 4GA, Monarch blue G, Monarch blue toner NCNF X 2810, Monastral blue, Monastral blue B, Monastral fast blue, Monastral fast paper blue B, Monolite fast blue BNVSA, No 2712 blue cyan B, Nyastral blue BC, Nylofil blue BLL, Ocean blue, Palomar blue B 4773, Peacoline blue, Permaline blue, Permanent blue BT 398, blue phthalo B base, (phthalocyaninate) cupric, blue phthalocyanine-alpha, phthalocyanine blue-beta, light blue of phthalocyanine VK, Phthalogen brilliant blue IF 3GK, Phthalogen turquoise IFBK, Pigment blue ciba 376S, Pigment fast blue BN, Celestial pigment of phthalocyanine VK, Plastol blue B, Polymo blue FFG, PV fast blue A 2R, PV fast blue B, Ramapo blue, Renol blue B 2G-H, Resamine fast blue B, Resanine blue B 4703, Resino blue F, Rubber blue BKA, Sandorin blue 2GLS, Sanyo cyanine blue BN, Segnale light turquoise BDS, Siegle fast blue BS, Siegle fast blue LBGO, Skyline blue B4712 , Solastral blue B, Solfast sky blue, Sumkiaprint cyanine blue GN-O, Sumitone cyanine blue HB, Sunfast blue, Suprapal green 3X4A041, Synthaline blue, Tetor blue, blue talo no. 1, Turquoise blue base G, Unisperse blue G-E, Versal blue A, Iragon Blue DBL86, Dispers blue 69-007 and Hostafine Blue B2G. The unstable coloring agents in the presence of bleach which are preferred herein are selected from the group consisting of copper phthalocyanosine blue (commercially available under the trade name Dye Pigmosol Blue 15®, from BASF); Direct Blue 86 (available on the market under the trade name Iragon Blue DBL86®, from Clariant); Pigment blue 15: 1 (commercially available under the trade name of Disperse Blue 69-007®, from BASF); and Pigment blue 15: 3 (commercially available under the trade name of Hostafine Blue B2G®, from Clariant); and mixtures of these. In a particularly preferred embodiment according to the present invention, the unstable coloring agent in the presence of bleach herein is cupric phthalocyanine blue. Copper phthalocyanine blue is available commercially under the trade name Dye Pigmosol Blue 15®, from BASF). Accordingly, the term "stable agent in the presence of bleach" is to be understood herein as an agent dye that generally experiences a loss of activity equal to or less than 80% for the dye or pigment at 50 ° C ± 0.5 ° C after 10 days of storage with respect to its activity in a fresh or "fresh" composition comprising the 0% active halide by weight of the composition (in order to avoid immediate decomposition of the compound) and 0.002% by weight of the coloring agent. An example of a stable coloring agent in the presence of bleach includes the ultramarine blue classified in C.l. (color index or color index, for its acronym in English) with the reference Pigment Blue 29; C.l. 77007, marketed by the company Holliday Pigments. Another stable coloring agent in the presence of bleach is Cl 69825 which is known in C.l. with the names of Vat Blue and Pigment Blue 64. Surprisingly, it was recently discovered that the cyclic amine hindered in accordance with the present invention is capable of stabilizing unstable brighteners in the presence of bleach and unstable coloring agents in the presence of bleach which are especially prone to being attacked by hypohalide bleaches and therefore extremely difficult to incorporate in a stable manner in the bleaching compositions comprising them. Indeed, the cyclic hindered amine of the present shows an improved stabilizing performance for unstable brighteners in the presence of bleach and unstable coloring agents in the presence of bleach in compositions containing hypohalide bleach as compared to stabilizing or debugging agents. currently known radicals, such as benzoic acid, p-toluenesulfonic acid and sodium m-methoxybenzoic acid and m-anisic acid. Without intending to be restricted by theory, it is believed that the specific hindered amine of the present not only acts as a radical scavenger in the bleaching composition of the present invention, but also operates as a stabilizer for other species, such as the ionic intermediates which they form during the oxidative degradation of unstable brighteners in the presence of bleach and / or unstable coloring agents in the presence of bleach in compositions containing hypohalide bleach. Furthermore, it has surprisingly been found that the specific cyclic hindered amine according to the present invention leads to a considerable reduction in the loss of available chlorine in the compositions herein during the storage thereof. The percentage of available chlorine loss can be measured by the method described, for example, in "Analyzes des Eaux et Extraits de Javel" of "La chambre syndicale nationale de L'eau de Javel et des produits connexes", pages 9 to 10 ( 1984). This method consists in measuring the hypohalide bleach present in the freshly made compositions, that is, just after its preparation, and in the same compositions after 10 days at 50 ° C.

Optional chelating agents In the compositions of the present invention, the presence of a chelating agent in addition to a radical scavenger is not mandatory, but is particularly preferred. It is believed that the presence of a chelating agent in the compositions of the present invention further contributes to the stability of the brighteners, pigments and / or unstable dyes in the presence of bleach, especially during prolonged periods of storage, and also contributes to the whiteness and optimal care of the fabric. The suitable chelating agent can be any of those known to persons with experience in the industry, such as those selected from the group comprising phosphonate chelating agents, phosphate chelating agents, aromatic chelating agents with polyfunctional substitutions, ethylenediamine-N acids , N'-disuccinic, or mixtures of these. Chelating agents may be convenient in the compositions of the present invention, preferably the phosphate chelating agents, such as phytic acid, since they make an additional contribution to the benefit provided by the radical scavengers herein further improving the stability of the brighteners and thereby provide an effective whiteness performance in any laundry application after the aging of the compositions, ie after prolonged storage periods.

Phosphonate chelating agents suitable for use herein may include ethan-1-hydroxy bisphosphonates (HEDP), alkylene poly (alkylene phosphonate), as well as amino phosphonate compounds, including amino aminotri (methylene phosphonic acid) (ATMP), nitrilotris (methylene phosphonic acid) (NTP), ethylenediamine tetra (methylene phosphonic acid), and diethylene triamine penta (methylene phosphonic acid) (DTPMP) of alkali metals. The phosphonate compounds may be present either in their acid form or as salts of different cations in some or all of their acid functional groups. The phosphonate chelating agents that are preferred to be used herein are diethylenetriamine pentamethylene phosphonate (DTPMP) and ethane 1 -hydroxydiphosphonate (HEDP). Phosphonate chelating agents are distributed by Monsanto under the trade name DEQUEST®. Phosphate chelating agents that are suitable for use in the compositions of the present invention are described in EP-A-0 867 502, in the section entitled "The Phosphate ingredient"; these ingredients are specifically incorporated herein by reference, especially for their fabric bleaching benefit (ie, the effect that prevents fabrics from taking a yellowish color) and / or the benefit of optimal fabric care. All of the phosphate ingredients described in EP-A-0 867 502 of the section entitled "The Phosphate Ingredient" are suitable for use herein. Preferred phosphate chelating agents for use herein are phosphate ingredients linear, where R of the formula of the section entitled "The Phosphate ingredient" of the patent EP-A-0 867 502 is M, and where n is 1 (pyrophosphate) on is 2 (tripolyphosphate) (STPP)), more preferably, where n is 2. The most commonly available form of these phosphates is one in which M is sodium. Clearly, the preferred phosphate chelating agents for use in the compositions of the present invention are pyrophosphate and / or tripolyphosphate (STPP), more preferably, sodium phosphate and / or sodium tripolyphosphate (STPP). Phytic acid, which is especially suitable for use herein, is a hexaphosphoric acid which occurs naturally in the seeds of many cereal grains, generally in the form of an insoluble calcium-magnesium salt. It can also be derived from the liquor of a macerated corn. Commercial-grade phytic acid is available commercially from J. T. Baker Co., for example, as a 40% aqueous solution. The objective sought is that the present invention covers the acidic form of phytic acid as well as the derivatives of alkali metal salts thereof, especially the potassium or sodium salts. Sodium phytate is commercially available through Chemical Co (Brooklyn, N.Y.). In fact, since the typical pH of the compositions of the present invention is in the alkaline pH range, the phytic acid component exists mainly as an ionized salt in the liquid compositions herein, even when added in its acidic form. The mixtures of phytic acid salts are also covered.

In the compositions herein, aromatic chelating agents with polyfunctional substitutions may also be useful. See U.S. Pat. no. 3 812 044, granted on May 21, 1974 to Connor et al. Preferred compounds of this type in the acid form are dihydroxydisulfobenzenes such as 1,2-dihydroxy-3,5-disulfobenzene. A preferred biodegradable chelating agent for use herein is ethylene diamine N, N'-disuccinic acid or the alkali metal, alkaline earth, ammonium salts or the ammonium substitute salts thereof or mixtures thereof. Ethylenediamine-N, N'-disuccinic acids, particularly the isomer (S, S), have been extensively described in U.S. Pat. no. 4,704,233 issued to Hartman and Perkins on November 3, 1987. Ethylenediamine-N, N'-disuccinic acid is, for example, commercially available under the tradename ssEDDS® from Palmer Research Laboratories. Especially preferred chelating agents for use herein are phosphate chelating agents, such as sodium pyrophosphate, sodium triphosphate, phytic acid and mixtures thereof. Generally, compositions herein comprise up to 10%, preferably from 0.01% to 5% by weight, more preferably, from 0.05% to 2% and, most preferably, from 0.1% to 1.5%, by weight of the composition, of a chelating agent or a mixture of these.

Optional pH Buffer Components In the compositions of the present invention, the presence of a buffer component is not mandatory, but its use is preferred. It is believed that the presence of a buffer component in the compositions of the present invention additionally contributes to the stability of these compositions, to an effective bleaching performance and also to optimal care of the fabric. Clearly, the buffer component of the pH allows the alkalinity of the bleaching solution to be controlled, that is, to maintain the pH of the bleaching solution at a pH of at least 7.5, preferably at least 8 and, more preferably, at least less 8. 5, for a longer period of time from the time the dilution is completed (for example, when the bleaching composition of the present invention is diluted in the bleaching solution with a dilution concentration of 500: 1 (water: composition )). It is believed that the buffer component of the pH can also contribute to the stability of the unstable ingredients in the presence of bleach in the present. The buffer component of the pH ensures that the pH of the composition is buffered to a pH value ranging from 7.5 to 13, preferably from 8 to 12, more preferably from 8.5 to 11.5, after the composition has been reduced. diluted in 1 to 500 times its weight of water. The pH buffering components which are suitable for use herein are selected from the group consisting of alkali metal salts of carbonates, polycarbonates, sesquicarbonates, silicates, polysilicates, boron salts, phosphates, stannates, aluminates and mixtures thereof Most preferably, alkali metal salts of carbonate, silicate and borate The preferred alkali metal salts to be used herein are sodium and potassium. Particularly preferred pH's are selected from the group consisting of sodium carbonate, sodium silicate, sodium borate, sodium metaborate and mixtures of these. The raw materials involved in the preparation of hypohalide bleaches usually contain byproducts, for example, calcium carbonate, which result in an amount of up to 0 4% by weight of the by-product within the hypohalide composition. However, in that amount, the by-product will not have the buffering action defined above. The liquid bleaching compositions herein may contain an amount of buffer component of the pH from 0 5% to 9% by weight, preferably from 0 5% to 5% by weight and, more preferably, in an amount from 0 6% to 3%, by weight of the composition Optional Surfactants The liquid compositions of the present invention may comprise a surfactant as a particularly preferred optional ingredient Surprisingly, it has been found that the presence of surfactants can contribute greatly to improving the overall stability of the compositions.

Liquid in accordance with the present invention Without intending to be restricted by any theory, it is speculated that the improved overall stability is due to the increased hydrophobic interaction between reactive compounds, such as unstable brighteners in the presence of bleach or unstable coloring agents in the presence of bleach, and to the micellar environment created when the compositions of the present invention comprise a surfactant. The surfactants may be present in the compositions herein in amounts ranging from 0 1% to 50%, preferably from 0 1% to 40% and, more preferably, from 1% to 30%, by weight of the composition. Surfactants suitable for use herein include anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, zwittenonic surfactants, and mixtures thereof. In a particularly preferred embodiment, the surfactant is selected from the group consisting of alkyl sulfate, alkyl ether sulfate and mixtures thereof Anionic surfactants suitable for use in the compositions herein include salts or water soluble acids with the formula ROSO3M, wherein R is preferably a hydrocarbyl of do-C24, preferably a linear or branched alkyl having an alkyl component of C10-C20, more preferably, a linear or branched alkyl of C12-C18, and M is H or a cation, for example, a cation of alkali metals (such as sodium, potassium or lithium), ammonium or substituted ammonium (for example, methyl-, dimethyl- and trimethylammonium cations and the quaternary ammonium cations, such as the tetramethyl ammonium and dimethyl piperidinium cations and the quaternary ammonium cations derived from alkylamines, such as ethylamine, diethylamine, triethylamine and mixtures thereof and the like ). Other anionic surfactants suitable for use in the present invention are water soluble salts or acids with the formula RO (A) mSO3M, wherein R is an unsubstituted, straight or branched alkyl group of C6-C24 having an alkyl component of C6-C24 preferably a C 0 -C 20 alkyl, linear or branched, more preferably, a C 2 -C 18 alkyl, linear or branched; A is an ethoxy or propoxy unit, m is greater than zero, generally between about 0.5 and about 30, more preferably between about 0.5 and about 5, and M is H or a cation which may be, for example, a metal cation ( for example, sodium, potassium, lithium, calcium, magnesium, etc.), ammonium cation or substituted ammonium. Included are alkyl ethoxylated sulfates and also alkyl propoxylates. Some specific examples of the substituted ammonium cations include methyl, dimethyl, trimethylammonium and quaternary ammonium cations, such as tetramethylammonium, dimethylpiperidinium and cations derived from alkanolamines, such as ethylamine, diethylamine, triethylamine, mixtures thereof and the like. Illustrative surfactants are alkyl polyethoxylate sulfate (1.0) of C12-Ci8, sulfate E (1.0) of C12-C18, sulfate of alkyl polyethoxylate (2.25) of d2-C18. sulfate E (2.25) of C? 2-C? a, alkyl polyethoxylate sulfate (3.0) of C? 2-C18. sulfate E (3.0) of C12-C? ß and alkylpolyethoxylate sulfate (4.0) of C12-C? ß, sulfate E (4.0) of C? 2-C? 8, wherein the counterion is cniently selected from sodium and potassium. In a particularly preferred embodiment of the present invention, the surfactant system used is an anionic surfactant system, in particular, an alkyl alkoxy (preferably ethoxy) sulfate used alone, for example, alkyl (ethoxy) 3 sulfate, or in combination with a cosurfactant , preferably a C2-C2 alkyl sulfate and / or a C8-C22 alkyl or aryl sulfonate such as C8-C22 benzenesulfonate and / or another alkyl alkoxy sulfate in addition to the ethoxylated 3. Clearly, the presence of said alkyl (ethoxy) Sulfate alone or in combination with a cosurfactant provides the desired viscosity to the compositions herein and provides excellent stain removal properties, especially when these compositions are used in any laundry application. In a particularly preferred embodiment, the alkyl (ethoxy) sulfate is triethoxylated sulfate of lauryl alcohol. In general, the compositions according to the present invention have a viscosity of between 0.025 Pa.s (25 cps) and 1.5 Pa.s (1500 cps), preferably between 0.05 Pa.s (50 cps) and 1.1 Pa.s ( 1 100 cps), depending on the relationship between AE3S and the cosurfactant, when these are measured with a rheometer such as the Carri-Med CSL2-100® with the following viscosity parameters: angle: 1 ° 58, opening: 60, diameter: 4.0 cm, inside: 63.60, at a temperature of 25 ° C and at a shear rate of 30 1 / sec. Other anionic surfactants useful for detersive purposes can also be used in the present invention.

The nonionic surfactants especially suitable for use herein are the non-ionic surfactants ethoxylated with cap according to the formula R1 (OR2) nOR3 wherein Ri is a linear or branched alkyl or alkenyl group of C 8 -C 8, aryl group, alkylaryl group, preferably R 5 is a C 10 -C 15 alkyl or alkenyl group, more preferably an alkyl group of C 10 -C 5 R 2 is a linear or branched C 2 -C 10 alkyl group, preferably a C 4 group R 3 is a C 1 -C 10 alkyl or alkenyl group, preferably a C 5 alkyl group, and n is an integer included in the group range from 1 to 20, preferably from 1 to 10, more preferably, from 1 to 5, or mixtures thereof. These surfactants are distributed by BASF under the trade name of Plurafac®, by HOECHST under the trade name of Genapol®, or by ICI under the name Trademark of Symperonic® Preferred ethoxylated nonionic surfactants of the above formula are those commercially available under the tradename Genapol® L 2 5 NR from Hoechst and Symperonic® LF / CS 1100 from ICI Other suitable nonionic surfactants for use herein include a class of compounds that can be defined in general as compounds produced by the condensation of alkylene oxide groups (hydrophilic in nature) with an organic hydrophobic compound, which may be a linear or branched aliphatic (for example, Guerbet or secondary alcohol) or alkyl of aromatic nature. The length of the polyoxyalkylene or hydrophilic radical that is condensed with any of the hydrophobic groups can be easily regulated to produce a water-soluble compound having the desired degree of equilibrium between hydrophilic and hydrophobic elements. The zwitterionic detergents which are suitable for use herein comprise betaine detergents and betaine-like detergents, wherein the molecule contains base groups and acid groups which form an inner salt which gives the molecule both anionic and cationic hydrophilic groups in a broad spectrum of pH values. Some common examples of these detergents are described in U.S. Pat. num. 2,082,275, 2,702,279 and 2,255,082. Amphoteric and ampholytic detergents which can be cationic or anionic according to the pH of the system are represented by detergents such as dodecyl beta-alanine, N-alkyl taurines, such as is prepared by reacting dodecylamine with sodium isethionate in accordance with the instructions in U.S. Pat. no. 2,658,072, higher N alkylapartic acids, such as those produced in accordance with the teachings of U.S. Pat. no. 2,438,091, and the products sold under the trade name "Miranol", as described in U.S. Pat. no. 2,528,378. Additional synthetic detergents and the list of their commercial sources can be found in McCutcheon's Detergents and Emulsifiers, North American Ed. 1980.

Other Optional Ingredients The bleaching compositions herein may further include a variety of optional ingredients, for example, whitening activators, stain suspending agents, polyamine polymers for soil suspension, polimeric soil release agents, systems / agents. foam reducers, catalysts, dye transfer agents, perfumes, hydrotropes and solvents Method for reducing or preventing the decomposition of an unstable brightener in the presence of bleach and / or an unstable coloring agent in the presence of bleach in a bleaching composition comprising a hypohalide bleach Accordingly, the present invention also encompasses a method for reducing or avoiding the decomposition of a compound selected from the group consisting of unstable brighteners in the presence of bleach, unstable coloring agents in the presence of bleach and mixtures thereof, in a bleaching composition comprising a hypohalide bleach, said method comprising the incorporation of a cyclic amine hindered in the bleaching composition Use of a hindered cyclic amine to reduce or prevent the decomposition of an unstable brightener in the presence of bleach and / or an unstable coloring agent in the presence of bleach in a bleaching composition comprising a hypohalide bleach Another aspect of the present invention invention relates to the use, in a bleaching composition comprising a hypohalide bleach, of a hindered cyclic amine to reduce or prevent the decomposition of a compound selected from the group consisting of unstable brighteners in the presence of bleach, unstable coloring agents in the presence of bleach and mixtures thereof, in the bleaching composition.

Process for the treatment of fabrics In the present, the bleaching composition of the present invention is used by applying the liquid bleaching composition to the fabric to be treated. The liquid compositions herein are applied to the fabric per se in pure or diluted form. In general, the compositions herein are used in diluted form in a washing operation. The term "in diluted form" refers herein to the fact that the fabric bleaching compositions according to the present invention can be diluted by the user preferably with water. This dilution can be carried out, for example, in hand washing applications and also using other means, for example, in a washing machine. The compositions can be used in levels of dilution up to 1500: 1 (solvent: composition) preferably from 5: 1 to 1000: 1 and more preferably from 10: 1 to 700: 1 (solvent: composition). The term "in pure form" refers herein to liquid bleach compositions being applied directly to the fabrics to be treated without any dilution, ie, the liquid compositions herein are applied to the fabrics as described at the moment. Fabrics that will be treated herein include, but are not limited to, clothing, curtains, fabric ornaments, bedding, bathing suits, linens, sleeping bags, or tents. The expression "treating a fabric" refers here to the cleaning of a fabric or the action of bleaching or disinfecting it. In the treatment process (for example, cleaning and / or bleaching) of a fabric, the bleaching composition herein is brought into contact with the fabric to be treated. This can be done either in a so-called "pretreatment mode", in which a liquid bleaching composition, as described herein, is applied pure on the fabrics before said fabrics are rinsed or these fabrics are washed and then rinse; or in a "soaking mode", wherein a solid or liquid bleaching composition, as described herein, is first diluted in an aqueous bath and the fabrics are immersed and impregnated in that bath prior to rinsing; or in a "washing mode", in which a solid or liquid bleaching composition, as described herein, is added to the wash liquor formed by dissolving or dispersing a typical laundry detergent, preferably in a washing machine. It is also essential in both cases that the fabrics be rinsed after coming into contact with the composition before said composition has completely dried. More specifically, the fabric bleaching process according to the present invention preferably comprises the steps of first contacting the fabrics with a bleaching composition in accordance with the present invention to then allow those fabrics to remain in contact with the composition. for a period of time sufficient to whiten said fabrics and then rinse them with water. If the fabrics are to be washed, that is, with a conventional composition comprising at least one active surface agent, the washing of said fabrics with a detergent composition comprising at least one active surface agent can be carried out before the step in which the The fabrics are brought into contact with the bleaching composition and / or in the step in which said fabrics are brought into contact with said bleaching composition and / or after the passage in which said fabrics are brought into contact with the bleaching composition and before the bleaching composition. of rinsing and / or after the rinsing step. The bleaching composition can be used in pure or diluted form. When used diluted, the bleaching composition should be kept in contact with the fabric normally from 1 to 60 minutes, preferably from 5 to 30 minutes. Whereas, when the bleaching composition is used in its pure form, it must remain in contact with the fabric for a much shorter time, usually from 5 seconds to 30 minutes, preferably from 1 minute to 10 minutes. It is preferred to perform the bleaching process of the present before the fabrics are washed. Indeed, it has been observed that bleaching the fabrics with the compositions herein (bleaching processes with diluted or pure composition) before washing them with a detergent composition considerably improves the whiteness and the removal of stains using less energy and detergent than if first they will wash the fabrics and then they will be bleached. Alternatively, instead of following the pure bleaching process as described above (pretreatment application) with a rinsing step and / or a conventional washing step with a conventional liquid or powder detergent, to the pretreatment bleaching operation also You can follow the diluted bleaching process as described above, either in a bucket (manual operation) or in a washing machine.

Process for the treatment of hard surfaces Another embodiment of the present invention encompasses a process for treating a hard surface with a composition, as described herein, wherein preferably said process comprises the step of applying the composition to said hard surface, with more preference, only to dirty parts thereof, and optionally rinsing the hard surface.

In the process of treating hard surfaces according to the present invention, the composition, as described herein, can be applied to the surface to be treated in its pure form or in its diluted form. In the diluted form, it is preferred that the composition is diluted in up to 200 times its weight of water, preferably 80 to 2 times its weight of water and, more preferably, 60 to 2 times its weight of water Depending on the intended end use, the compositions herein They can be packaged in a variety of containers such as conventional bottles, bottles equipped with pellet applicators, sponge, brush, atomizers, sachets, sachets, boxes, etc.

EXAMPLES The following examples will further illustrate the present invention. The compositions of the examples are intended to exemplify the compositions in accordance with the present invention, but are not necessarily used to limit or in any other way define the scope of the present invention.

Composition 1 (% weight) Composition II (% weight) AvCI2 3% AvCI2 3% Tempoxy LO® 0 145% Tinogard® SF-X 0 036% Tinopal CBS-X® 0 02% Tinopal AMS-GX® 0 02% Pigmosol Blue 6900® 0 002% Pigmosol Blue 6900® 0 002% Water and minor components up to 100% Water and minor components up to 100 Composition III (% weight) Composition IV (% weight) AvCI2 3% AvCI2 3% Tempoxy LO® 0 072% Tmogard® SF-X 0 036% Tinopal 5BM-GX® 0 02% Optiblanc BRB ® 0 02% AE3S 1 580% AE3S 1 580% Hostafine Blue B2G® 0 002% STPP 0 049% Water and minor components up to 100% Iragon Blue DBL86® 0 002% Water and minor components up to 100% All examples have a pH of 11, adjusted with Tempoxy LO® NaOH commercially distributed by 3V Sigma Tinogard® SF-X, commercially distributed by Ciba Specialty Chemicals Tinopal CBS-X®, Tinopal AMS-GX® and Tinopal 5BM-GX®, commercially distributed by Ciba Specialty Chemicals Pigmosol Blue 6900® commercially distributed by BASF Iragon Blue DBL86® and Hostafine Blue B2G®, commercially distributed by Clanant Comparative data The following examples will further illustrate the present invention. The compositions were made by combining the ingredients listed in the proportions listed (% by weight, unless otherwise indicated). The compositions of Examples VI, B and D are intended to exemplify the compositions according to the present invention, but are not necessarily used to limit or otherwise define the scope of the present invention The compositions of examples V, VII, HIV, A and C are comparative examples All examples have a pH above 11, adjusted with NaOH. AvCl2 Chlorine available, the compositions contain sodium hypochlorite TMBA is benzoic acid 3,4,5 -trimethoxy, distributed in the market by Hunan Shineway 3,5-DMBA is benzoic acid 3,5-dimethoxy, distributed in the market by Aldrich CuPht is blue of phthalocyanine copper, distributed on the market by BASF as Pigmosol Blue 6900®.

Effect on the Stability of the Brightener The compositions V to VIII were aged in a rapid aging test or RAT as described herein (10 days at 50 ° C). The loss of activity of the Tinopal CBS-X® brightener caused by the bleach was evaluated as described herein by measuring the residual content of the brightener in the corresponding "aged" bleaching compositions (in ppm) by HPLC analysis (liquid chromatography). high pressure). The results are presented in the table below. The above results clearly show improved stability of the brightener, obtained with a hypohalide-containing bleaching composition according to the present invention (composition VI), ie, compositions comprising a hindered cyclic amine, as compared to comparative compositions comprising stabilizers commonly known (compositions VII and VIII).

Effect on the stability of the coloring agent: A comparative study of the stability of the coloring agent was made by aging the compositions A, B, C and D in a RAT test as described herein (10 days at 50 ° C). The loss of coloring agent activity caused by the bleach was evaluated by visual rating, as described above. Clearly, the loss of coloring agent activity caused by the bleach in the "aged" composition was compared to the coloring agent activity in a freshly made or "fresh" composition comprising 0% active halide by weight of the composition and 0 002% by weight of the same coloring agent The activity scale of the coloring agent measured in PSU varies from 0, which means that it does not exist an appreciable difference of color in the "aged" composition compared to the "fresh" composition, up to 5, which means that there is a clearly noticeable difference in the color of the "aged" composition when compared to the "fresh" composition The above results clearly show an improved stability of the coloring agent, obtained with the bleaching composition containing hypohalide and incorporating a hindered cyclic amine (compositions B and D) with respect to the comparative compositions, wherein a composition does not comprise any stabilizer (composition A) and the other composition comprises a commonly known stabilizer (TMBA in composition C) The TMBA stabilizer is recognized, up to now, as the best stabilizer of its kind for bleaching compositions containing hypohalide and also comprising an unstable brightener before the presence of bleach and / or an unstable coloring agent in the presence of bleach

Claims (20)

1. NOVELTY OF THE INVENTION CLAIMS 1. A liquid bleaching composition comprising a hypohalide bleach, a cyclic hindered amine and a compound selected from the group consisting of unstable brighteners in the presence of bleach, unstable coloring agents in the presence of bleach and mixtures thereof. 2. The liquid bleaching composition according to claim 1, further characterized in that the hindered cyclic amine is selected from compounds having the general formula: wherein X- ?, X2, X3 and X, independently or together, represent methyl or ethyl; Ri is H, methyl, ethyl, oxyl, hydroxyl or alkoxy; and R2 is H, hydroxyl, alkoxy or oxycarbonyl. 3. The liquid bleaching composition according to claims 1 to 2, further characterized in that the cyclic amine hindered is selected from the group consisting of 4-hydroxy-2,2,6,6-tetramethyl piperidine; 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxy piperidine; 1-oxoyl-2, 2, 6, 6, -tetramethyl piperidine; 1-Oxyl-2,2,6,6-tetramethyl-4-hydroxy piperidine. 4. The liquid bleaching composition according to claims 1 to 3, further characterized in that the hindered cyclic amine is 1-oxoyl-2,2,6,6-tetramethyl-4-hydroxy piperidine. 5. The liquid bleaching composition according to claims 1 to 3, further characterized in that the hindered cyclic amine is 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxy piperidine. 6. The liquid bleaching composition according to any of the preceding claims, further characterized in that the composition comprises from 0.001% to 5%, preferably from 0.005% to 2.5%, more preferably from 0.01% to 1.0% and, with the maximum preference, from 0.02% to 0.05%, by weight of the total composition, of the hindered cyclic amine. The liquid bleaching composition according to any of the preceding claims, further characterized in that the hypohalide bleach is an alkali metal hypochlorite and / or an alkaline earth metal hypochlorite. 8. The liquid bleaching composition according to any of the preceding claims, further characterized in that the hypohalide bleach, based on active halide, is present in an amount of 0.01% to 20% by weight of the composition. 9. The liquid bleaching composition according to any of the preceding claims, further characterized in that the brightener unstable in the presence of bleach is selected from the group consisting of 4,4'-bis- (2-sulphotryl) -biphenyl disodium; 4,4'-bis - [(4,6-di-anilino-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate disodium; 4,4'-bis - [(4-anilino-6-morpholin-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate; and 4,4'-bis [(4-anilino-6-bis-2 (2-hydroxyethyl) -amino-S-triazine-2-yl) -amino] -stilbene 2,2'-disulfonate; and mixtures of these. 10. The liquid bleaching composition according to any of the preceding claims, further characterized in that the brightener unstable in the presence of bleach herein is 4,4'-bis- (2-sulphotryl) -biphenyl disodium. 11. The liquid bleaching composition according to any of the preceding claims, further characterized in that the composition comprises from 0.001% to 1.0%, by weight of the total composition, of unstable brightener in the presence of bleach. 12. The liquid bleaching composition according to any of the preceding claims, further characterized in that the coloring agent unstable in the presence of bleach is selected from the group consisting of: phthalocyanine blue cupric; Direct Blue 86; Pigment blue 15: 1; Pigment blue 15: 3; and mixtures of these. 13. The liquid bleaching composition according to any of the preceding claims, further characterized because the unstable coloring agent in the presence of bleach is blue phthalocyanine copper. 14. The liquid bleaching composition according to any of the preceding claims, further characterized in that the composition comprises from 0.001% to 1.0%, by weight of the total composition, of the unstable coloring agent in the presence of bleach. 15. A method for reducing or preventing the decomposition of a compound selected from the group consisting of unstable brighteners in the presence of bleach, unstable coloring agents in the presence of bleach and mixtures thereof, in a bleaching composition comprising a hypohalide bleach; The method comprises incorporating, in the bleaching composition, a hindered cyclic amine according to any of the preceding claims. 16. A fabric treatment process comprising the step of applying a liquid whitening composition, according to any of claims 1 to 14, on the fabrics to be treated. 17. The use, in a bleaching composition comprising a hypohalide bleach, of a hindered cyclic amine to reduce or prevent the decomposition of a compound selected from the group consisting of unstable brighteners in the presence of bleach, unstable coloring agents in the presence of bleach and mixtures thereof, in the bleaching composition. 18. The use claimed in claim 17 to reduce or prevent the decomposition of unstable brighteners in the presence of bleach. 19. The use according to claims 17 to 18, wherein the cyclic hindered amine is 1-oxoyl-2,2,6,6-tetramethyl-4-hydroxypiperidine. 20. The use claimed in claims 17 to 18, wherein the hindered cyclic amine is 1-hydroxy-2,2,6,6-tetramethyl-4-hydroxy piperidine.